Rudolf Steiner's investigation in man's past by consculting the Akasha Chronica (a bit like Edgar Cayce) is quite detailed.
He speaks of 7 earth epochs. Our current epoch is designated by his research as the 5th.
1st: Polarian
2nd: Hyperborean
3rd: Lemurian
4th: Atlantean
5th: Current

The Yuga system (refer Yukteswar) is in harmony with this knowledge, though shifted by precisely 300 years, for some reason that I haven't been able to identify. There are the Greater Yuga rhythms and then the Lesser ones, and distinction between them is crucial... the list above is the Lesser. It is also important to consider the alternation between the Yugas. Satya->Treta->Dvapara->Kali->Dvapara->Treta->Satya

There is also an important consequence of this... the descending arc, from Indian to Greco-Roman is revamped again in the ascending arc. For example, the Anglo-German Age is a transformation, an upgrade if you will, of the Egypto Chaldean age, while the Russian Age transforms the Persian epoch. If you notice our present day culture, and even our interests, the majority of it is seen in a sort of racial memory of the Egyptian epoch... from the Stargate Egyptian mythos, to interest in the Sumerian records, scientific interest in the Pyramids, the desire to preserve the human body (in life rather than in death), heck even the obsession with cats... Ancient Egypt and Sumeria are rising again in modern culture, in successive stages. Only question is if they have been transformed or not... the untransformed parts will be quite poisonous, as the researchers of Tutankhamen found out in a physical sense.